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Forensic DNA extraction from decomposed human soft tissues: Optimization using ethanol treatment and surfactant-based
Ga Eun Kim1, Eun-Byoul Jung1, Seung Eun Lee1
1Laboratory of Forensic Medicine, Department of Anatomy and Cell Biology, Sungkyunkwan University School of Medicine, Suwon, South Korea.
Forensic Science International
|April 11, 2026
Summary
Optimized DNA extraction from decomposed human soft tissues using chilled ethanol and improved buffers significantly enhances forensic genetic profiling success, even in advanced decomposition stages.
Area of Science:
- Forensic Science
- Molecular Biology
- Genetics
Background:
- DNA degradation in postmortem remains complicates genetic profiling.
- Soft tissues are often challenging for DNA extraction due to decomposition.
Purpose of the Study:
- To optimize DNA extraction from decomposed human soft tissues.
- To evaluate modified protocols involving chilled ethanol and surfactant-based lysis.
- To assess the impact on downstream Short Tandem Repeat (STR) profiling.
Main Methods:
- Compared standard silica-column method with modified protocols (ethanol pretreatment, alternative buffers).
- Analyzed DNA yield, purity, concentration, and degradation index.
- Evaluated STR profiling performance (mismatch, drop-in/out rates, peak heights).
Main Results:
- Ethanol pretreatment and combined protocols significantly increased DNA yield and purity.
- Modified protocols yielded higher double-stranded DNA concentrations.
- STR analysis showed reduced errors and improved peak heights, especially with advanced decomposition.
Conclusions:
- Optimized DNA extraction strategies enhance STR profiling success from decomposed soft tissues.
- Modified protocols broaden the suitability of postmortem specimens for forensic genetic analysis.
Keywords:
DNA extraction optimizationDecomposed soft tissuesForensic DNA extractionPostmortem degradationSTR profilingMore Related Videos
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